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Some part of a \(50\%\) solution of acid was replaced with an equal amount of \(30\%\) solution of acid. If, as a result

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by Vincen » Thu Mar 11, 2021 11:26 am
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Some part of a \(50\%\) solution of acid was replaced with an equal amount of \(30\%\) solution of acid. If, as a result, \(40\%\) solution of acid was obtained, what part of the original solution was replaced?


A. \(\dfrac15\)

B. \(\dfrac14\)

C. \(\dfrac12\)

D. \(\dfrac34\)

E. \(\dfrac45\)

Answer: C

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